Display Device Optical Lens Phase Retardation Layer
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Solution Overview
Problem
Head-mounted displays face challenges in effectively displaying augmented reality images due to reduced field of view and performance limitations, often requiring micro displays with short focal lengths and small pixels, which can lead to light loss and ghost image phenomena.
Innovation Solution
A display device comprising a light-emitting layer, an optical layer with a phase retardation layer, a selective reflection layer, and a polarization layer, along with an optical lens that includes a reflective mirror and a phase retardation layer, which converts circularly polarized light into linearly polarized light to minimize light loss and prevent ghost images by absorbing reflected light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a micro display with short focal length and small pixels is used, then spatial resolution is improved, but light loss increases
Solution Approach 1:
The patent applies the principle of converting harm into benefit by utilizing the reflected light that would normally cause loss and ghost images. The reflective mirror and polarization layers are designed to convert the harmful reflected light into useful light that contributes to the final image, thereby reducing light loss and eliminating ghost images while maintaining high spatial resolution
Solution Approach 2:
The patent employs parameter changes by introducing phase retardation layers that modify the polarization state of light. These layers change the optical parameters of the system to convert circularly polarized light into linearly polarized light, optimizing light transmission and reducing losses in the optical path
2Measurement precision
If a micro display with short focal length and small pixels is used, then spatial resolution is improved, but ghost images occur
Solution Approach 1:
The patent converts the harmful reflected light that causes ghost images into a beneficial component. By using the polarization layer and reflective mirror in a specific configuration, the system transforms the ghost image-forming reflected light into useful light that enhances the main image, thereby eliminating ghost images while maintaining high spatial resolution
Solution Approach 2:
The patent introduces polarization layers as intermediary elements between the display panel and the reflective mirror. These polarization layers act as mediators that control the polarization state of light, preventing the formation of ghost images while allowing the main image to pass through to the optical lens
3Loss of energy
If light transmission is optimized, then light emission efficiency is improved, but polarization control becomes complex
Solution Approach 1:
The patent segments the polarization control function into separate, dedicated layers. The first polarization layer handles initial polarization control, while the second polarization layer handles final polarization adjustment. This segmentation allows each layer to perform its specific function independently, optimizing light emission efficiency while keeping the overall polarization control manageable through modular design
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances light emission efficiency and reduces ghost image occurrences, ensuring reliable image production by optimizing light transmission and polarization within the display device.
Implementation Method 1
an optical lens disposed on the optical layer and including an optical lens phase retardation layer in which circularly polarized light provided from the optical layer is converted into linearly polarized light
Implementation Method 2
a selective reflection layer disposed on the first phase retardation layer and configured to output linearly polarized light by transmitting light coincident with a polarization axis and to reflect light not coincident with the polarization axis
Implementation Method 3
a second phase retardation layer disposed on the selective reflection layer in which the linearly polarized light incident from the selective reflection layer is converted into the circularly polarized light
Implementation Method 4
a polarization layer disposed on the selective reflection layer and configured to absorb light reflected by the reflective mirror
Data Source
AI summary
A display device includes a display panel including a light-emitting layer, an optical layer disposed on the display panel, and an optical lens disposed on the optical layer and including an optical lens phase retardation layer in which circularly polarized light provided from the optical layer is converted into linearly polarized light. The optical layer includes a first phase retardation layer disposed on the display panel, a selective reflection layer disposed on the first phase retardation layer and configured to output linearly polarized light by transmitting light coincident with a polarization axis and to reflect light not coincident with the polarization axis, and a second phase retardation layer disposed on the selective reflection layer in which the linearly polarized light incident from the selective reflection layer is converted into the circularly polarized light.